I found out about Billboard in 2010, and for a quick moment there was a point where you could view the full charts from every date (the Hot 100 atleast). A few weeks later, I remember we couldn't. It went to where it is now where you can only view the T10 from previous weeks.
So annoying. But luckily there's basically all Billboard Magazines on Google Books from like 1993-2008 and you can find a lot of tea there.